Testing Outlet Pressure Of Solenoid Valve - Komatsu PC88MR-10 Shop Manual

Testing outlet pressure of solenoid valve

a Testing tools
Sym-
Part No.
bol
799-101-5002 Hydraulic tester
1
790-261-1204 Digital hydraulic tester
Q
799-401-3100 Adapter (size: 02)
2
Lower the work equipment to the ground and
stop the engine. Operate the control levers
several times to release the remaining
pressure in the piping, and then loosen the
oil filler cap of the hydraulic tank slowly to
release the internal pressure.
a Before testing the solenoid valve outlet pressure,
check that the control circuit oil pressure is
normal.
a Check this item under the following conditions.
Hydraulic oil temperature: 45 to 55°C
Testing
(PC88MR-PQPT-362-K-00-A)
1. Remove the left front testing cover and
disconnect outlet hoses (1) to (4) of the solenoid
valves to be tested.
No. Solenoid valve to be tested
1 PPC lock solenoid valve
Travel speed selector solenoid valve
2
Swing parking brake solenoid valve
3
Merge-divider valve
4
2. Install adapter Q2 and connect the disconnected
hose again.
3. Install nipple [1] of hydraulic tester Q1, and
connect them to oil pressure gauge [2].
a Use the oil pressure gauge of 5.9 MPa {60
kg/cm 2 }.
PC88MR-10
Part name
30 Testing and adjusting
(PC88MR-PQPT-360-K-00-A)
4. Start the engine.
5. Run the engine at high idle, operate each control
lever and switch, turn the solenoid valve ON or
OFF, and measure the output pressure.
a The conditions for turning the solenoid valve
ON/OFF, see the operation table of each
solenoid valve.
a You can check the operating condition of the
solenoid valve with the monitoring function of
the machine monitor (For details, see
SPECIAL FUNCTIONS OF MACHINE
MONITOR).
Monitoring code: 02300 solenoid 1
a For standard values, see "Standard value
table for machine".
6. After finishing the test, remove the testing tools,
and restore the machine.
Hydraulic system
30-55